U.S. patent application number 13/982887 was filed with the patent office on 2013-11-21 for exhaust gas processing device for diesel engine.
This patent application is currently assigned to KUBOTA CORPORATION. The applicant listed for this patent is Katsushi Inoue, Yuuki Ishii, Yongchol Lee, Tomohiro Ninomiya. Invention is credited to Katsushi Inoue, Yuuki Ishii, Yongchol Lee, Tomohiro Ninomiya.
Application Number | 20130305694 13/982887 |
Document ID | / |
Family ID | 46602613 |
Filed Date | 2013-11-21 |
United States Patent
Application |
20130305694 |
Kind Code |
A1 |
Inoue; Katsushi ; et
al. |
November 21, 2013 |
EXHAUST GAS PROCESSING DEVICE FOR DIESEL ENGINE
Abstract
An exhaust gas processing device for a diesel engine includes a
DPF, a PM deposition amount estimating unit for PM deposited in the
DPF, a DPF regenerating unit, a DPF regeneration control unit, a
storage unit, an acceleration regeneration request information
notifying unit, an acceleration regeneration start operating unit,
and a mode selecting unit. When a normal regeneration process is
selected, the time at which acceleration regeneration request
determination reserve period T1 elapses from the start of the
normal regeneration process without the end of the normal
regeneration process is time T2 for acceleration regeneration
request determination, at which time, if the PM deposition amount
estimation value is greater or equal to acceleration regeneration
request determination value J2, it is determined that there is the
acceleration regeneration request. The DPF regeneration control
unit allows the acceleration regeneration request information
notifying unit to start notification of the acceleration
regeneration request information.
Inventors: |
Inoue; Katsushi; (Sakai-shi,
JP) ; Ishii; Yuuki; (Sakai-shi, JP) ; Lee;
Yongchol; (Sakai-shi, JP) ; Ninomiya; Tomohiro;
(Sakai-shi, JP) |
|
Applicant: |
Name |
City |
State |
Country |
Type |
Inoue; Katsushi
Ishii; Yuuki
Lee; Yongchol
Ninomiya; Tomohiro |
Sakai-shi
Sakai-shi
Sakai-shi
Sakai-shi |
|
JP
JP
JP
JP |
|
|
Assignee: |
KUBOTA CORPORATION
Osaka-shi, Osaka
JP
|
Family ID: |
46602613 |
Appl. No.: |
13/982887 |
Filed: |
January 26, 2012 |
PCT Filed: |
January 26, 2012 |
PCT NO: |
PCT/JP2012/051608 |
371 Date: |
July 31, 2013 |
Current U.S.
Class: |
60/281 |
Current CPC
Class: |
F01N 3/023 20130101;
F02D 41/405 20130101; F01N 3/035 20130101; F02D 41/1446 20130101;
F02D 41/029 20130101; F02D 2200/0812 20130101; Y02T 10/47 20130101;
F01N 9/002 20130101; Y02T 10/40 20130101; F01N 3/10 20130101; F01N
9/005 20130101; F01N 2900/0601 20130101; F01N 2900/1606
20130101 |
Class at
Publication: |
60/281 |
International
Class: |
F01N 3/10 20060101
F01N003/10 |
Foreign Application Data
Date |
Code |
Application Number |
Feb 2, 2011 |
JP |
2011-020386 |
Claims
1. An exhaust gas processing device for a diesel engine comprising:
a DPF (1); a PM deposition amount estimating unit (2) for PM
deposited in the DPF (1); a DPF regenerating unit (3); a DPF
regeneration control unit (4); a storage unit (5); an acceleration
regeneration request information notifying unit (6); an
acceleration regeneration start operating unit (7); and a mode
selecting unit (41) which selects a permission mode and an
inhibition mode of a normal regeneration process, wherein the
storage unit (5) stores a plurality of determination values (J2)
and (J3) for a PM deposition amount estimation value and an
acceleration regeneration request determination reserve period
(T1), the plurality of determination values (J2) and (J3) including
the acceleration regeneration request determination value (J2) and
the normal regeneration start determination value (J3) which is
higher than the acceleration regeneration request determination
value (J2), the DPF regeneration control unit (4) comparing the PM
deposition amount estimation value estimated by the PM deposition
amount estimating unit (2) with the plurality of determination
values (J2) and (J3), wherein when the permission mode of the
normal regeneration process is selected by the mode selecting unit
(41), when the PM deposition amount estimation value is increased
to the normal regeneration start determination value (J3), the DPF
regeneration control unit (4) automatically allows the DPF
regenerating unit (3) to start the normal regeneration process in
step (S3) for increasing a temperature of exhaust gas which passes
through the DPF (1), wherein a time at which the acceleration
regeneration request determination reserve period (T1) elapses from
start of the normal regeneration process in step (S3) without end
of the normal regeneration process in step (S6) is a time (T2) for
acceleration regeneration request determination, and when at the
time (T2) for acceleration regeneration request determination, the
PM deposition amount estimation value is equal to or more than the
acceleration regeneration request determination value (J2), it is
determined that there is an acceleration regeneration request so
that the DPF regeneration control unit (4) allows the acceleration
regeneration request information notifying unit (6) to start
notification of acceleration regeneration request information in
step (S10), wherein when an acceleration regeneration start
operation is performed by the acceleration regeneration start
operating unit (7), the DPF regeneration control unit (4) allows
the DPF regenerating unit (3) to switch the normal regeneration
process to an acceleration regeneration process in step (S12) to
increase the temperature of the exhaust gas which passes through
the DPF (1) for accelerating a regenerating speed of the DPF (1) as
compared with the normal regeneration process, wherein when the
inhibition mode of the normal regeneration process is selected by
the mode selecting unit (41), the DPF regeneration control unit (4)
allows the DPF regenerating unit (3) not to execute the normal
regeneration process.
2. The exhaust gas processing device for a diesel engine according
to claim 1, wherein the storage unit (5) stores an acceleration
regeneration request re-determination period (T3), and when the
permission mode of the normal regeneration process is selected by
the mode selecting unit (41), when the PM deposition amount
estimation value is lower than the acceleration regeneration
request determination value (J2) at the time (T2) for acceleration
regeneration request determination, it is determined that there is
no the acceleration regeneration request so that the DPF
regeneration control unit (4) continues the normal regeneration
process in step (S17) even during the acceleration regeneration
request re-determination period (T3) following the time (T2) for
acceleration regeneration request determination, and when the PM
deposition amount estimation value is increased to the acceleration
regeneration request determination value (J2) without the end of
the normal regeneration process in step (S6) during the
acceleration regeneration request re-determination period (T3), it
is determined that there is the acceleration regeneration request
so that the DPF regeneration control unit (4) allows the
acceleration regeneration request information notifying unit (6) to
start the notification of the acceleration regeneration request
information in step (S10), wherein a time at which the acceleration
regeneration request re-determination period (T3) elapses is a time
(T4) for re-determination end, and when at the time (T4) for
re-determination end, the PM deposition amount estimation value is
not increased to the acceleration regeneration request
determination value (J2), the DPF regeneration control unit (4)
ends the normal regeneration process in step (S20).
3. The exhaust gas processing device for a diesel engine according
to claim 1, wherein when the inhibition mode of the normal
regeneration process is selected by the mode selecting unit (41)
before a time (T0) for the increase of the PM deposition amount
estimation value to the normal regeneration start determination
value (J3), the normal regeneration process is not started even
when the PM deposition amount estimation value is increased to the
normal regeneration start determination value (J3), and when before
the elapse of the acceleration regeneration request determination
reserve period (T1), the DPF regeneration control unit (4) allows
the acceleration regeneration request information notifying unit
(6) to start the notification of the acceleration regeneration
request information in step (S24), and when the acceleration
regeneration start operation is performed by the acceleration
regeneration start operating unit (7), the DPF regeneration control
unit (4) allows the DPF regenerating unit (3) to start the
acceleration regeneration process in step (S26).
4. The exhaust gas processing device for a diesel engine according
to claim 2, wherein when the permission mode of the normal
regeneration process is switched to the inhibition mode thereof by
the mode selecting unit (41) without the end of the normal
regeneration process in step (S6) during the acceleration
regeneration request determination reserve period (T1), the DPF
regeneration control unit (4) ends the normal regeneration process
in step (S6)', and a predetermined time by the time the
determination reserve period (T1) elapses from the time at which
the mode is switched is a time (T5) for acceleration regeneration
request determination, and when at the time (T5) for acceleration
regeneration request determination, the PM deposition amount
estimation value is equal to or more than the acceleration
regeneration request determination value (J2), it is determined
that there is the acceleration regeneration request so that the DPF
regeneration control unit (4) allows the acceleration regeneration
request information notifying unit (6) to start the notification of
the acceleration regeneration request information in step (S10)',
wherein when the acceleration regeneration start operation is
performed by the acceleration regeneration start operating unit
(7), the DPF regeneration control unit (4) allows the DPF
regenerating unit (3) to start the acceleration regeneration
process in step (S12)'.
5. The exhaust gas processing device for a diesel engine according
to claim 2, wherein when the permission mode of the normal
regeneration process is switched to the inhibition mode thereof by
the mode selecting unit (41) without the end of the normal
regeneration process in step (S20) during the acceleration
regeneration request re-determination period (T3), the DPF
regeneration control unit (4) ends the normal regeneration process
in step (S20)', and when the PM deposition amount estimation value
is increased to the acceleration regeneration request determination
value (J2) by the time the re-determination period (T3) elapses
from a time (T6) for mode switching, it is determined that there is
the acceleration regeneration request so that the DPF regeneration
control unit (4) allows the acceleration regeneration request
information notifying unit (6) to start the notification of the
acceleration regeneration request information in step (S10)', and
when the acceleration regeneration start operation is performed by
the acceleration regeneration start operating unit (7), the DPF
regeneration control unit (4) allows the DPF regenerating unit (3)
to start the acceleration regeneration process in step (S12)'.
6. The exhaust gas processing device for a diesel engine according
to claim 1, wherein when the DPF regeneration control unit (4)
allows the DPF regenerating unit (3) to continue the acceleration
regeneration process in step (S31), when the PM deposition amount
estimation value is decreased to the acceleration regeneration
request determination value (J2) which is the lower limit value of
the acceleration regeneration request, the DPF regeneration control
unit (4) ends the acceleration regeneration process in step
(S29).
7. The exhaust gas processing device for a diesel engine according
to claim 1, further comprising a DPF abnormality information
notifying unit (8), wherein the storage unit (5) stores a DPF
abnormality determination value (J4) which is higher than the
normal regeneration start determination value (J3), and when the PM
deposition amount estimation value is increased to the DPF
abnormality determination value (J4), the DPF regeneration control
unit (4) allows the DPF abnormality information notifying unit (8)
to start the notification of the DPF abnormality information in
step (S33).
8. The exhaust gas processing device for a diesel engine according
to claim 1, wherein the storage unit (5) stores the normal
regeneration end determination value (J1) which is lower than the
acceleration regeneration request determination value (J2), wherein
when the normal regeneration process decreases the PM deposition
amount estimation value to the normal regeneration end
determination value (J1), the DPF regeneration control unit (4)
ends the normal regeneration process in steps (S6) and (S20).
9. The exhaust gas processing device for a diesel engine according
to claim 1, wherein the normal regeneration process is executed
along with at least one of driving and operation of a machine on
which an engine is mounted, and the acceleration regeneration
process is executed while both of the driving and operation of the
machine on which the engine is mounted are stopped.
10. The exhaust gas processing device for a diesel engine according
to claim 1, wherein the DPF regenerating unit (3) combines a common
rail system (9) with a DOC (10) on an upstream side of the DPF (1),
and the normal regeneration process and the acceleration
regeneration process mix uncombusted fuel into the exhaust gas by
post injection after main injection from an injector (27) of the
common rail system (9), oxidize and combust the uncombusted fuel
with oxygen in the exhaust gas by the DOC (10) to increase the
temperature of the exhaust gas which passes through the DPF (1).
Description
TECHNICAL FIELD
[0001] The present invention relates to an exhaust gas processing
device for a diesel engine. More specifically, the present
invention relates to an exhaust gas processing device for a diesel
engine, which can suppress fuel consumption deterioration and
output reduction.
[0002] In the terms of the specification and claims, a DPF means a
diesel particulate filter, a PM means a particulate matter in
exhaust gas, and a DOC means an oxidation catalyst.
BACKGROUND ART
[0003] Conventionally, an exhaust gas processing device for a
diesel engine includes a DPF, a PM deposition amount detecting unit
for PM deposited in the DPF, a forcible regenerating unit, a
forcible regeneration control unit, and a forcible regeneration
notifying unit (for instance, see FIGS. 1 and 2 in Patent Document
1).
[0004] In this conventional technique, when the DPF captures the PM
in exhaust gas to cause a first state in which a PM deposition
amount detection value reaches a first set value, forcible
regeneration at driving which operates the forcible regenerating
unit at the time of driving a vehicle is automatically started to
combust and remove the PM, and when the PM cannot be combusted and
removed in the forcible regeneration at driving to cause a second
state in which the PM deposition amount detection value is further
increased to reach a second set value which is higher than the
first set value, the forcible regeneration notifying unit is
operated to notify that it is necessary to perform forcible
regeneration at stopping which operates the forcible regenerating
unit at stopping.
[0005] However, in this conventional technique, after the PM
deposition amount detection value reaches the first set value to
start the forcible regeneration at driving, unless the PM
deposition amount detection value reaches the second set value
which is higher than the first set value, the necessity of the
forcible regeneration at stopping cannot be notified. So it is a
problem.
PRIOR ART DOCUMENT
Patent Document
[0006] Patent Document 1: Japanese Patent Laid-open Publication No.
2005-113752
SUMMARY OF THE INVENTION
Problems to be Solved by the Invention
[0007] <<Problem>>
[0008] Fuel consumption deterioration and output reduction can be
caused.
[0009] After the PM deposition amount detection value reaches the
first set value to start the forcible regeneration at driving, when
the PM combustion removing speed and the PM depositing speed are
countervailed to stay the PM deposition amount detection value near
the first set value for a long time of period, the necessity of the
forcible regeneration at stopping cannot be notified so that the
forcible regeneration at driving is continued for a long time of
period. Consequently, fuel consumption deterioration and output
reduction can be caused.
[0010] An object of the present invention is to provide an exhaust
gas processing device for a diesel engine, which can suppress fuel
consumption deterioration and output reduction.
Solutions to the Problems
[0011] The invention subject matter of the invention according to
claim 1 is as follows.
[0012] As exemplified in FIG. 1, an exhaust gas processing device
for a diesel engine includes a DPF (1); a PM deposition amount
estimating unit (2) for PM deposited in the DPF (1); a DPF
regenerating unit (3); a DPF regeneration control unit (4); a
storage unit (5); an acceleration regeneration request information
notifying unit (6); an acceleration regeneration start operating
unit (7); and a mode selecting unit (41) which selects a permission
mode and an inhibition mode of a normal regeneration process,
[0013] wherein the storage unit (5) stores a plurality of
determination values (J2) and (J3) for a PM deposition amount
estimation value and an acceleration regeneration request
determination reserve period (T1), which are exemplified in FIGS. 2
to 5,
[0014] the plurality of determination values (J2) and (J3)
including the acceleration regeneration request determination value
(J2) and the normal regeneration start determination value (J3)
which is higher than the acceleration regeneration request
determination value (J2),
[0015] the DPF regeneration control unit (4) comparing the PM
deposition amount estimation value estimated by the PM deposition
amount estimating unit (2) with the plurality of determination
values (J2) and (J3),
[0016] as exemplified in FIGS. 2, 4, and 5, when the permission
mode of the normal regeneration process is selected by the mode
selecting unit (41),
[0017] when the PM deposition amount estimation value is increased
to the normal regeneration start determination value (J3), the DPF
regeneration control unit (4) automatically allows the DPF
regenerating unit (3) to start the normal regeneration process in
step (S3) for increasing a temperature of exhaust gas which passes
through the DPF (1),
[0018] as exemplified in FIGS. 2 and 5, a time at which the
acceleration regeneration request determination reserve period (T1)
elapses from start of the normal regeneration process in step (S3)
without end of the normal regeneration process in step (S6) is a
time (T2) for acceleration regeneration request determination, and
when at the time (T2) for acceleration regeneration request
determination, the PM deposition amount estimation value is equal
to or more than the acceleration regeneration request determination
value (J2), it is determined that there is an acceleration
regeneration request so that the DPF regeneration control unit (4)
allows the acceleration regeneration request information notifying
unit (6) to start notification of acceleration regeneration request
information in step (S10),
[0019] as exemplified in FIGS. 2 and 5, when an acceleration
regeneration start operation is performed by the acceleration
regeneration start operating unit (7), the DPF regeneration control
unit (4) allows the DPF regenerating unit (3) to switch the normal
regeneration process to an acceleration regeneration process in
step (S12) to increase the temperature of the exhaust gas which
passes through the DPF (1) for accelerating a regenerating speed of
the DPF (1) as compared with the normal regeneration process,
[0020] as exemplified in FIGS. 3 to 5, when the inhibition mode of
the normal regeneration process is selected by the mode selecting
unit (41),
[0021] the DPF regeneration control unit (4) allows the DPF
regenerating unit (3) not to execute the normal regeneration
process.
Effects of the Invention
[0022] (Invention According to Claim 1)
[0023] The invention according to claim 1 provides the following
effects.
[0024] <<Effect>>
[0025] Fuel consumption deterioration and output reduction can be
suppressed.
[0026] As illustrated in FIGS. 2 and 5, when the permission mode of
the normal regeneration process is selected by the mode selecting
unit (41), after the PM deposition amount estimation value is
increased to a normal regeneration start determination value (J3)
so that the DPF regeneration control unit (4) automatically starts
the normal regeneration process in step (S3), even when the PM
combustion removing speed and the PM depositing speed are
countervailed to stay the PM deposition amount estimation value
near the normal regeneration start determination value (J3), the
notification of the acceleration regeneration request information
is started in step (S10) at time (T2) for acceleration regeneration
request determination after the elapse of the acceleration
regeneration request determination reserve period (T1), so that the
normal regeneration process can be immediately switched to the
acceleration regeneration process in step (S12). Therefore, fuel
consumption deterioration and output reduction due to the longer
normal regeneration process can be suppressed.
[0027] <<Effect>>
[0028] The inhibition of the normal regeneration process which is
automatically started and continued can be selected.
[0029] As illustrated in FIGS. 3 to 5, when the inhibition mode of
the normal regeneration process is selected by the mode selecting
unit (41), the DPF regeneration control unit (4) allows the DPF
regenerating unit (3) not to execute the normal regeneration
process. Therefore, in a state in which the execution of the normal
regeneration process is not appropriate, the inhibition of the
normal regeneration process which is automatically started and
continued can be selected.
[0030] The state in which the execution of the normal regeneration
process is not appropriate is referred to as e.g., a state in which
a machine on which this engine is mounted is required to hold
exhaust gas to be more clean at low temperature in a room, park, or
the like.
[0031] (Invention According to Claim 2)
[0032] In addition to the effect of the invention according to
claim 1, the invention according to claim 2 provides the following
effect.
[0033] <<Effect>>
[0034] The normal regeneration process after the elapse of the
acceleration regeneration request determination reserve period can
be prevented from being longer.
[0035] As illustrated in FIG. 2, when the permission mode of the
normal regeneration process is selected by the mode selecting unit
(41), during the acceleration regeneration request re-determination
period (T3), the DPF regeneration control unit (4) ends the normal
regeneration process in step (S20) or starts the notification of
the acceleration regeneration request information in step (S10).
Therefore, the normal regeneration process after the elapse of the
acceleration regeneration request determination reserve period (T1)
can be prevented from being longer.
[0036] (Invention According to Claim 3)
[0037] In addition to the effect of the invention according to
claim 1 or 2, the invention according to claim 3 provides the
following effect.
[0038] <<Effect>>
[0039] The acceleration regeneration process can be immediately
started.
[0040] As exemplified in FIG. 3, when the inhibition mode of the
normal regeneration process is selected by the mode selecting unit
(41) before a time (T0) for the increase of the PM deposition
amount estimation value to the normal regeneration start
determination value (J3), the normal regeneration process is not
started even when the PM deposition amount estimation value is
increased to the normal regeneration start determination value
(J3), and when before the elapse of the acceleration regeneration
request determination reserve period (T1), the DPF regeneration
control unit (4) allows the acceleration regeneration request
information notifying unit (6) to start the notification of the
acceleration regeneration request information in step (S24), and
when the acceleration regeneration start operation is performed by
the acceleration regeneration start operating unit (7), the DPF
regeneration control unit (4) allows the DPF regenerating unit (3)
to start the acceleration regeneration process in step (S26), so
that the acceleration regeneration process can be immediately
started in step (S26).
[0041] (Invention According to Claim 4)
[0042] In addition to the effect of the invention according to
claim 2, the invention according to claim 4 provides the following
effect.
[0043] <<Effect>>
[0044] The acceleration regeneration process can be immediately
started.
[0045] As exemplified in FIG. 4, when the permission mode of the
normal regeneration process is switched to the inhibition mode
thereof by the mode selecting unit (41) without the end of the
normal regeneration process in step (S6) during the acceleration
regeneration request determination reserve period (T1), the DPF
regeneration control unit (4) ends the normal regeneration process
in step (S6)', and a predetermined time by the time the
determination reserve period (T1) elapses from the time at which
the mode is switched is a time (T5) for acceleration regeneration
request determination, and when at the time (T5) for acceleration
regeneration request determination, the PM deposition amount
estimation value is equal to or more than the acceleration
regeneration request determination value (J2), it is determined
that there is the acceleration regeneration request so that the DPF
regeneration control unit (4) allows the acceleration regeneration
request information notifying unit (6) to start the notification of
the acceleration regeneration request information in step (S10)',
when the acceleration regeneration start operation is performed by
the acceleration regeneration start operating unit (7), the DPF
regeneration control unit (4) allows the DPF regenerating unit (3)
to start the acceleration regeneration process in step (S12)'.
Therefore the acceleration regeneration process can be immediately
started.
[0046] (Invention According to Claim 5)
[0047] In addition to the effect of the invention according to
claim 2 or 4, the invention according to claim 5 provides the
following effect.
[0048] <<Effect>>
[0049] Even when the permission mode of the normal regeneration
process is switched to the inhibition mode thereof, the
acceleration regeneration process can be started without any
trouble.
[0050] As illustrated in FIG. 5, when the permission mode of the
normal regeneration process is switched to the inhibition mode
thereof by the mode selecting unit (41) without the end of the
normal regeneration process in step (S20) during the acceleration
regeneration request re-determination period (T3), the DPF
regeneration control unit (4) ends the normal regeneration process
in step (S20)', and when the PM deposition amount estimation value
is increased to an acceleration regeneration request determination
value (J2) by the time re-determination period (T3) elapses from
time (T6) for mode switching, it is determined that there is the
acceleration regeneration request so that the DPF regeneration
control unit (4) allows the acceleration regeneration request
information notifying unit (6) to start the notification of the
acceleration regeneration request information in step (S10)', and
when the acceleration regeneration start operation is performed by
the acceleration regeneration start operating unit (7), the DPF
regeneration control unit (4) allows the DPF regenerating unit (3)
to start the acceleration regeneration process in step (S12)'.
Therefore, even when the permission mode of the normal regeneration
process is switched to the inhibition mode thereof, the
acceleration regeneration process can be started without any
trouble.
[0051] (Invention According to Claim 6)
[0052] In addition to the effect of the invention according to any
of claims 1 to 5, the invention according to claim 6 provides the
following effect.
[0053] <<Effect>>
[0054] The acceleration regeneration process can be prevented from
being longer.
[0055] As illustrated in FIGS. 2 to 5, when the DPF regeneration
control unit (4) allows the DPF regenerating unit (3) to continue
the acceleration regeneration process in step (S31), when the PM
deposition amount estimation value is decreased to the acceleration
regeneration request determination value (J2) which is the lower
limit value of the acceleration regeneration request, the DPF
regeneration control unit (4) ends the acceleration regeneration
process in step (S29). Therefore, the acceleration regeneration
process can be prevented from being continued for a long time of
period.
[0056] In this case, even when the acceleration regeneration
process is ended, the PM deposition amount estimation value is
decreased to the lower limit value of the acceleration regeneration
request. Therefore, clogging in the DPF (1) can be considerably
eliminated, output reduction due to back pressure increase can be
suppressed to some degree, and there is no trouble in the engine
operation after the end of the acceleration regeneration
process.
[0057] (Invention According to Claim 7)
[0058] In addition to the effect of the invention according to any
of claims 1 to 6, the invention according to claim 7 provides the
following effect.
[0059] <<Effect>>
[0060] The necessity of an emergency measure can be provoked.
[0061] As illustrated in FIGS. 2 to 5, when the PM deposition
amount estimation value is increased to a DPF abnormality
determination value (J4), the DPF regeneration control unit (4)
allows the DPF abnormality information notifying unit (8) to start
the notification of the DPF abnormality information in step (S33).
Therefore, when abnormal PM deposition is caused, the necessity of
an emergency measure, such as engine stop and DPF cleaning in a
maintenance factory, can be invoked.
[0062] (Invention According to Claim 8)
[0063] In addition to the effect of the invention according to any
of claims 1 to 7, the invention according to claim 8 provides the
following effect.
[0064] <<Effect>>
[0065] The normal regeneration process can be prevented from being
longer.
[0066] As illustrated in FIGS. 2, 4, and 5, when the normal
regeneration process decreases the PM deposition amount estimation
value to a normal regeneration end determination value (J1) the DPF
regeneration control unit (4) ends the normal regeneration process
in steps (S6) and (S20). Therefore, the normal regeneration process
can be prevented from being longer.
[0067] (Invention According to Claim 9)
[0068] In addition to the effect of the invention according to any
of claims 1 to 8, the invention according to claim 9 provides the
following effect.
[0069] <<Effect>>
[0070] The acceleration regeneration process cannot trouble the
driving and operation of the machine on which the engine is
mounted.
[0071] The normal regeneration process is executed along with at
least one of the driving and operation of the machine on which the
engine is mounted, and the acceleration regeneration process is
executed while both of the driving and operation of the machine on
which the engine is mounted are stopped. Therefore, the
acceleration regeneration process cannot trouble the driving and
operation of the machine on which the engine is mounted.
[0072] (Invention According to Claim 10)
[0073] In addition to the effect of the invention according to any
of claims 1 to 9, the invention according to claim 10 provides the
following effect.
[0074] <<Effect>>
[0075] A common rail system is combined with a DOC to enable the
regeneration of the DPF.
[0076] As illustrated in FIG. 1, the common rail system (9) is
combined with the DOC (10) to enable the regeneration of the DPF
(1).
BRIEF DESCRIPTION OF THE DRAWINGS
[0077] FIG. 1 is a schematic diagram of an exhaust gas processing
device for a diesel engine according to an embodiment of the
present invention.
[0078] FIG. 2 is a time chart of a regeneration process by the
exhaust gas processing device for a diesel engine according to the
embodiment of the present invention, in which the permission mode
of a normal regeneration process is selected at all times.
[0079] FIG. 3 is a time chart of the regeneration process by the
exhaust gas processing device for a diesel engine according to the
embodiment of the present invention, in which the inhibition mode
of the normal regeneration process is selected before T0.
[0080] FIG. 4 is a time chart of the regeneration process by the
exhaust gas processing device for a diesel engine according to the
embodiment of the present invention, in which the permission mode
of the normal regeneration process is switched to the inhibition
mode thereof during T1.
[0081] FIG. 5 is a time chart of the regeneration process by the
exhaust gas processing device for a diesel engine according to the
embodiment of the present invention, in which the permission mode
of the normal regeneration process is switched to the inhibition
mode thereof during T3.
[0082] FIG. 6 is part of a flowchart of the regeneration process by
the exhaust gas processing device for a diesel engine according to
the embodiment of the present invention.
[0083] FIG. 7 is a flowchart continued from step (S9) of the
flowchart shown in FIG. 6.
[0084] FIG. 8 is a flowchart continued from steps (S12), (S12)',
and (S26) of the flowchart shown in FIG. 6.
EMBODIMENTS OF THE INVENTION
[0085] FIGS. 1 to 8 are drawings illustrating an exhaust gas
processing device for a diesel engine according to an embodiment of
the present invention. In this embodiment, an exhaust gas
processing device for a multi-cylinder diesel engine will be
described.
[0086] The overview of a diesel engine shown in FIG. 1 is as
follows.
[0087] A cylinder head (19) is assembled to the upper portion of a
cylinder block (18). An engine cooling fan (20) is arranged in the
front portion of the cylinder block (18). A flywheel (21) is
arranged in the rear portion of the cylinder block (18). A rotor
plate (22) is attached to the flywheel (21). In addition, a sensor
plate (24) is attached to a valve camshaft (23), and is arranged in
the rear portion of the cylinder block (18). An exhaust manifold
(25) is arranged on one side of the cylinder head (19). A
supercharger (26) is communicated with the exhaust manifold (25). A
DPF case (16) accommodates a DPF (1) therein, and is arranged on
the downstream side of a turbine (15) of the supercharger (26). The
DPF case (16) also accommodates a DOC (10) therein. Each injector
(27) is arranged for each cylinder in the cylinder head (19). The
injector (27) is connected to a common rail (28). The injector (27)
is provided with an electromagnetic valve (29). A fuel tank (31) is
connected to the common rail (28) via a fuel supply pump (30).
[0088] A target engine rotating speed setting unit (32), an actual
engine rotating speed detecting unit (33), a crank angle detecting
unit (34), and a cylinder determining unit (35) are engaged with
the electromagnetic valve (29) of the injector (27) via a control
unit (14). The target engine rotating speed setting unit (32) is a
potentiometer which outputs a target engine rotating speed, as a
voltage value, from the set position of a speed control lever. The
actual engine rotating speed detecting unit (33) and the crank
angle detecting unit (34) are pickup coils which face the outer
periphery of the rotor plate (22), and detect the number of teeth
provided at constant intervals on the outer periphery of the rotor
plate (22) to detect an actual engine rotating speed and a crank
angle. The cylinder determining unit (35) is a sensor for
determining the stroke state of the combustion cycle of each
cylinder based on the detection of a projection provided on the
sensor plate (24). The control unit (14) is an engine ECU. The ECU
is the abbreviation of an electronic control unit.
[0089] The control unit (14) controls the valve open timing and the
valve open continuation time of the electromagnetic valve (29) of
the injector (27) so as to reduce the deviation between a target
engine rotating speed and the actual engine rotating speed, and
allows the injector (27) to perform fuel injection in a
predetermined amount into a combustion chamber at a predetermined
injection timing.
[0090] The configuration of the exhaust gas processing device is as
follows.
[0091] As shown in FIG. 1, the exhaust gas processing device
includes the DPF (1), a PM deposition amount estimating unit (2)
for PM deposited in the DPF (1), a DPF regenerating unit (3), a DPF
regeneration control unit (4), a storage unit (5), an acceleration
regeneration request information notifying unit (6), an
acceleration regeneration start operating unit (7), and a mode
selecting unit (41) which selects a permission mode and an
inhibition mode of a normal regeneration process.
[0092] As shown in FIG. 1, the DPF (1) is a wall-flow monolith
which alternately seals the ends of adjacent cells (1a) of a
ceramic honeycomb carrier. Exhaust gas passes through the inside of
the cells (1a) and walls (1b) of the cells (1a) so that the PM is
captured on the walls (1b) of the cells (1a).
[0093] The PM deposition amount estimating unit (2) is a
predetermined computing unit of the engine ECU which is the control
unit (14), and estimates a PM deposition amount from a previously
experimentally determined map data based on an engine load, an
engine rotating speed, a detected exhaust gas temperature by a DPF
upstream side exhaust gas temperature sensor (36), an exhaust gas
pressure on the DPF upstream side by a DPF upstream side exhaust
gas pressure sensor (38), and the pressure difference between the
upstream and downstream sides of the DPF (1) by a differential
pressure sensor (37).
[0094] As shown in FIG. 1, the DPF regenerating unit (3) combines a
common rail system (9) with the DOC (10) on the upstream side of
the DPF (1). The normal regeneration process and an acceleration
regeneration process mix uncombusted fuel into exhaust gas by post
injection after main injection from the injector (27) of the common
rail system (9), oxidize and combust the uncombusted fuel with
oxygen in the exhaust gas by the DOC (10) to increase the
temperature of exhaust gas (11) which passes through the DPF
(1).
[0095] The DOC (10) has a flow-through configuration in which the
oxidation catalyst is supported by the ceramic honeycomb carrier
and both ends of each cell (10a) are opened, thereby passing
exhaust gas (12) therein.
[0096] As shown in FIG. 1, when the detected temperature of the
exhaust gas (12) on the DOC upstream side by a DOC upstream side
exhaust gas temperature sensor (40) is lower than the activating
temperature of the DOC (10), the DPF regeneration control unit (4)
allows the injector (27) of the common rail system (9) to perform
after-injection after the main injection and before the post
injection or reduces the opening of a suction throttle, thereby
increasing the temperature of the exhaust gas (12) to activate the
DOC (10). When the detected temperature of exhaust gas (13) on the
DPF downstream side by a DPF downstream side exhaust gas
temperature sensor (39) is higher than a predetermined abnormality
determination temperature, the DPF regeneration control unit (4)
allows a DPF abnormality information notifying unit (8) to start
the notification of DPF abnormality information, and at the same
time, stops the post injection and reduces the injection amount of
the post injection.
[0097] The DPF regenerating unit (3) may combine the injector which
injects the fuel into an exhaust pipe with the DOC or include an
electric heater arranged in an inlet of the DPF.
[0098] As shown in FIG. 1, the DPF regeneration control unit (4) is
provided in the engine ECU which is the control unit (14).
[0099] The storage unit (5) is a memory provided in the engine ECU
which is the control unit (4).
[0100] The storage unit (5) stores a plurality of determination
values (J1), (J2), and (J3) for the PM deposition amount estimation
value and an acceleration regeneration request determination
reserve period (T1), which are shown in FIG. 2. As shown in FIG. 2,
the plurality of determination values (J1), (J2), and (J3) include
the normal regeneration end determination value (J1), the
acceleration regeneration request determination value (J2), and the
normal regeneration start determination value (J3) in ascending
order of value.
[0101] The DPF regeneration control unit (4) compares the PM
deposition amount estimation value estimated by the PM deposition
amount estimating unit (2) with the determination values (J1),
(J2), and (J3).
[0102] As shown in FIG. 2, when the permission mode of the normal
regeneration process is selected by the mode selecting unit (41),
when the PM deposition amount estimation value is increased to the
normal regeneration start determination value (J3), the DPF
regeneration control unit (4) automatically allows the DPF
regenerating unit (3) to start the normal regeneration process in
step (S3) for increasing the temperature of the exhaust gas (11)
which passes through the DPF (1).
[0103] As shown in FIG. 2, while the acceleration regeneration
request determination reserve period (T1) elapses from the start of
the normal regeneration process in step (S3), when the PM
deposition amount estimation value is decreased to the normal
regeneration end determination value (J1), the DPF regeneration
control unit (4) ends the normal regeneration process in step
(S6).
[0104] When the PM deposition amount estimation value is not
decreased to the normal regeneration end determination value (J1),
the DPF regeneration control unit (4) continues the normal
regeneration process in step (S8).
[0105] As shown in FIG. 2, the time at which the acceleration
regeneration request determination reserve period (T1) elapses from
the start of the normal regeneration process in step (S3) without
the end of the normal regeneration process in step (S6) (with the
continuation of the normal regeneration process in step (S8)) is a
time (T2) for acceleration regeneration request determination, and
when at the time (T2) for acceleration regeneration request
determination, the PM deposition amount estimation value is equal
to or more than the acceleration regeneration request determination
value (J2), it is determined that there is an acceleration
regeneration request so that the DPF regeneration control unit (4)
allows the acceleration regeneration request information notifying
unit (6) to start the notification of the acceleration regeneration
request information in step (S10).
[0106] As shown in FIG. 2, when an acceleration regeneration start
operation is performed by the acceleration regeneration start
operating unit (7), the DPF regeneration control unit (4) allows
the DPF regenerating unit (3) to switch the normal regeneration
process to the acceleration regeneration process in step (S12) to
increase the temperature of the exhaust gas (11) which passes
through the DPF (1) for accelerating the regenerating speed of the
DPF (1) as compared with the normal regeneration process.
[0107] The acceleration regeneration process increases the
injection amount of the main injection and the post injection as
compared with the normal regeneration process to further increase
the temperature of the exhaust gas (11), thereby accelerating the
regenerating speed of the DPF (1).
[0108] As shown in FIG. 1, the acceleration regeneration request
information notifying unit (6) is a lamp provided in a dashboard of
a machine on which the diesel engine is mounted. The lamp is turned
on to notify the acceleration regeneration request information.
[0109] The acceleration regeneration start operating unit (7) is an
operating button provided in the dashboard. A driver or the like
manually presses the operating button to perform the acceleration
regeneration start operation.
[0110] The mode selecting unit (41) is an operating lever provided
in the dashboard. The driver manually switches the operating lever
to select the permission mode and the inhibition mode of the normal
regeneration process.
[0111] The storage unit (5) stores an acceleration regeneration
request re-determination period (T3) shown in FIG. 2. As shown in
FIG. 2, when the permission mode of the normal regeneration process
is selected by the mode selecting unit (41), when the PM deposition
amount estimation value is lower than the acceleration regeneration
request determination value (J2) at the time (T2) for acceleration
regeneration request determination, it is determined that there is
no acceleration regeneration request so that the DPF regeneration
control unit (4) continues the normal regeneration process in step
(S17) even during an acceleration regeneration request
re-determination period (T3) following the time (T2) for
acceleration regeneration request determination, and when the PM
deposition amount estimation value is decreased to the normal
regeneration end determination value (J1) without the end of the
normal regeneration process in step (S20) during the acceleration
regeneration request re-determination period (T3), the DPF
regeneration control unit (4) ends the normal regeneration process
in step (S20), and when the PM deposition amount estimation value
is increased to the acceleration regeneration request determination
value (J2), it is determined that there is the acceleration
regeneration request so that the DPF regeneration control unit (4)
allows the acceleration regeneration request information notifying
unit (6) to start the notification of the acceleration regeneration
request information in step (S10).
[0112] The time at which the acceleration regeneration request
re-determination period (T3) elapses is a time (T4) for
re-determination end, and when at the time (T4) for
re-determination end, the DPF deposition amount estimation value is
not increased to the acceleration regeneration request
determination value (J2), the DPF regeneration control unit (4)
ends the normal regeneration process in step (S20) even when the PM
deposition amount estimation value is not decreased to the normal
regeneration end determination value (J1).
[0113] As shown in FIG. 2, when the DPF regeneration control unit
(4) allows the DPF regenerating unit (3) to continue the
acceleration regeneration process in step (S31), when the PM
deposition amount estimation value is decreased to the acceleration
regeneration request determination value (J2) which is the lower
limit value of the acceleration regeneration request, the DPF
regeneration control unit (4) ends the acceleration regeneration
process in step (S29).
[0114] As shown in FIG. 1, the exhaust gas processing device
includes the DPF abnormality information notifying unit (8). The
storage unit (5) stores a DPF abnormality determination value (J4)
which is higher than the normal regeneration start determination
value (J3) shown in FIG. 2. As shown in FIG. 2, when the PM
deposition amount estimation value is increased to the DPF
abnormality determination value (J4), the DPF regeneration control
unit (4) allows the DPF abnormality information notifying unit (8)
to start the notification of the DPF abnormality information in
step (S33).
[0115] As shown in FIG. 1, the DPF abnormality information
notifying unit (8) is a lamp provided in the dashboard of the
machine on which the diesel engine is mounted. The lamp is turned
on to notify the DPF abnormality information.
[0116] As shown in FIGS. 3 to 5, when the inhibition mode of the
normal regeneration process is selected by the mode selecting unit
(41), the DPF regeneration control unit (4) allows the DPF
regenerating unit (3) not to execute the normal regeneration
process.
[0117] As shown in FIG. 3, when the inhibition mode of the normal
regeneration process is selected by the mode selecting unit (41)
before a time (T0) for the increase of the PM deposition amount
estimation value to the normal regeneration start determination
value (J3), the normal regeneration process is not started even
when the PM deposition amount estimation value is increased to the
normal regeneration start determination value (J3), and when before
the elapse of the acceleration regeneration request determination
reserve period (T1), the DPF regeneration control unit (4) allows
the acceleration regeneration request information notifying unit
(6) to start the notification of the acceleration regeneration
request information in step (S24), and when the acceleration
regeneration start operation is performed by the acceleration
regeneration start operating unit (7), the DPF regeneration control
unit (4) allows the DPF regenerating unit (3) to start the
acceleration regeneration process in step (S26).
[0118] In FIG. 3, the time at which the notification of the
acceleration regeneration request information is started in step
(S24) is a time (T0) for the increase of the PM deposition amount
estimation value to the normal regeneration Stan determination
value (J3), but may be the time at which a predetermined time
elapses from the time (T0).
[0119] As shown in FIG. 4, when the permission mode of the normal
regeneration process is switched to the inhibition mode thereof by
the mode selecting unit (41) without the end of the normal
regeneration process in step (S6) (with the continuation of the
normal regeneration process in step (S8)) during the acceleration
regeneration request determination reserve period (T1), the DPF
regeneration control unit (4) ends the normal regeneration process
in step (S6)', and the time at which the mode is switched is a time
(T5) for acceleration regeneration request determination, and when
at the time (T5) for acceleration regeneration request
determination, the PM deposition amount estimation value is equal
to or more than the acceleration regeneration request determination
value (J2), it is determined that there is the acceleration
regeneration request so that the DPF regeneration control unit (4)
allows the acceleration regeneration request information notifying
unit (6) to start the notification of the acceleration regeneration
request information in step (S10)'.
[0120] When the acceleration regeneration start operation is
performed by the acceleration regeneration start operating unit
(7), the DPF regeneration control unit (4) allows the DPF
regenerating unit (3) to start the acceleration regeneration
process in step (S12)'.
[0121] In this embodiment, the time at which the permission mode of
the normal regeneration process is switched to the inhibition mode
thereof is the time (T5) for acceleration regeneration request
determination, but a predetermined time by the time the
determination reserve period (T1) elapses from the time at which
the permission mode of the normal regeneration process is switched
to the inhibition mode thereof may be the time (T5) for
acceleration regeneration request determination. A plurality of
times (T5) for acceleration regeneration request determination may
be provided.
[0122] As shown in FIG. 5, when the PM deposition amount estimation
value is decreased to the normal regeneration end determination
value (J1) during the elapse of the acceleration regeneration
request re-determination period (T3), the DPF regeneration control
unit (4) ends the normal regeneration process in step (S20).
[0123] When the PM deposition amount estimation value is not
decreased to the normal regeneration end determination value (J1),
the DPF regeneration control unit (4) continues the normal
regeneration process in step (S17).
[0124] As shown in FIG. 5, when the permission mode of the normal
regeneration process is switched to the inhibition mode thereof by
the mode selecting unit (41) without the end of the normal
regeneration process in step (S20) during the acceleration
regeneration request re-determination period (T3), the DPF
regeneration control unit (4) ends the normal regeneration process
in step (S20)', and when the PM deposition amount estimation value
is increased to the acceleration regeneration request determination
value (J2) by the time the re-determination period (T3) elapses
from a time (T6) for mode switching, it is determined that there is
the acceleration regeneration request so that the DPF regeneration
control unit (4) allows the acceleration regeneration request
information notifying unit (6) to start the notification of the
acceleration regeneration request information in step (S10)', and
when the acceleration regeneration start operation is performed by
the acceleration regeneration start operating unit (7), the DPF
regeneration control unit (4) allows the DPF regenerating unit (3)
to start the acceleration regeneration process in step (S12)'.
[0125] The diesel engine including the exhaust gas processing
device is mounted on an agricultural machine such as a combine, and
a constructing machine such as a backhoe. The normal regeneration
process is executed along with at least one of the driving and
operation of the machine on which the engine is mounted. The
acceleration regeneration process is executed while both of the
driving and operation of the machine on which the engine is mounted
are stopped.
[0126] The flow of the regeneration process by the engine ECU which
is the control unit is as follows.
[0127] As shown in FIG. 6, it is determined in step (S1) whether or
not the PM deposition amount estimation value is increased to the
normal regeneration determination value (J3). If no, the
determination is repeated. If yes, it is determined in step (S2)
whether or not the inhibition mode of the normal regeneration
process is selected. If no, that is, when the permission mode of
the normal regeneration process is selected, the normal
regeneration process is started in step (S3). The start of the
normal regeneration process in step (S3) in FIGS. 2, 4, and 5 is
executed through such steps.
[0128] Next, it is determined in step (S4) whether or not the
acceleration regeneration request determination reserve period (T1)
has elapsed from the start of the normal regeneration process. If
no, it is determined in step (S5) whether or not the PM deposition
amount estimation value is decreased to the normal regeneration end
determination value (J1). If yes, the normal regeneration process
is ended in step (S6) so that the routine returns to step (S1). If
no in the determination in step (S5), it is determined in step (S7)
whether or not the inhibition mode of the normal regeneration
process is selected. If no, that is, when the permission mode of
the normal regeneration process is selected, the normal
regeneration process is continued in step (S8) so that the routine
returns to step (S4). The end of the normal regeneration process in
step (S6) and the continuation of the normal regeneration process
in step (S8) during the determination reserve period (T1) in FIGS.
2, 4, and 5 are executed through such steps.
[0129] If yes in the determination in step (S4), it is determined
in step (S9) whether or not the PM deposition amount estimation
value is equal to or more than the acceleration regeneration
request determination value (J2). If yes, the notification of the
acceleration regeneration request information is started in step
(S10). Then, it is determined in step (S11) whether or not the
acceleration regeneration start operation is performed. If yes, the
normal regeneration process is switched to the acceleration
regeneration process in step (S12). The notification of the
acceleration regeneration request information in step (S10) and the
switching to the acceleration regeneration process in step (S12)
thereafter at the time (T2) for determination in FIGS. 2 and 5 are
executed through such steps.
[0130] If no in the determination in step (S11), the normal
regeneration process is continued in step (S13). It is determined
in step (S14) whether or not the PM deposition amount estimation
value is equal to or more than the acceleration regeneration
request determination value (J2). If no, the normal regeneration
process is ended in step (S15), and the notification of the
acceleration regeneration request information is ended in step
(S16), so that the routine returns to step (S1). If yes in the
determination in step (S14), the routine returns to step (S11).
[0131] If no in the determination in step (S9) in FIG. 6, as shown
in FIG. 7, the normal regeneration process is continued in step
(S17). It is determined in step (S18) whether or not the
acceleration regeneration request re-determination period (T3) has
elapsed. If no, it is determined in step (S19) whether or not the
PM deposition amount estimation value is decreased to the normal
regeneration end determination value (J1). If yes, the normal
regeneration process is ended in step (S20), so that the routine
returns to step (S1). The continuation of the normal regeneration
process in step (S17) and the end of the normal regeneration
process in step (S20) during the re-determination period (T3) in
FIGS. 2 and 5 are executed through such steps.
[0132] If no in the determination in step (S19), it is determined
in step (S21) whether or not the inhibition mode of the normal
regeneration process is selected. If no, that is, when the
permission mode of the normal regeneration process is selected, it
is determined in step (S22) whether or not the PM deposition amount
estimation value is equal to or more than the acceleration
regeneration request determination value (J2). If yes, the
notification of the acceleration regeneration request information
is started in step (S10). If no, the routine returns to step (S17).
The start of the notification of the acceleration regeneration
request information in step (S10) during the re-determination
period (T3) in FIGS. 2 and 5 is executed through such steps.
[0133] If yes in the determination in step (S18), and if yes in the
determination in step (S21), it is determined in step (S23) whether
or not the PM deposition amount estimation value is equal to or
more than the acceleration regeneration request determination value
(J2). If no, the normal regeneration process is ended in step
(S20), so that the routine returns to step (S1). The end of the
normal regeneration process in step (S20) at the time (T4) for
determination in FIG. 2 is executed through such steps.
[0134] If yes in the determination in step (S23), the notification
of the acceleration regeneration request information is started in
step (S10).
[0135] As shown in FIG. 6, if yes in the determination in step
(S2), that is, when the inhibition mode of the normal regeneration
process is selected, the notification of the acceleration
regeneration request information is started in step (S24) to
determine in step (S25) whether or not the acceleration
regeneration start operation is performed. If no, the determination
is repeated. If yes, the acceleration regeneration process is
started in step (S26). The start of the notification of the
acceleration regeneration request information in step (S24) and the
start of the acceleration regeneration process in step (S26) in
FIG. 3 are executed through such steps.
[0136] As shown in FIG. 6, if yes in the determination in step
(S7), that is, when the inhibition mode of the normal regeneration
process is selected during the acceleration regeneration request
determination reserve period (T1), the normal regeneration process
is ended in step (S6)' to determine in step (S27) whether or not
the PM deposition amount estimation value is equal to or more than
the acceleration regeneration request determination value (J2). If
yes in the determination, the notification of the acceleration
regeneration request information is started in step (S10)' to
perform the acceleration regeneration start operation, so that it
is determined yes in the determination in step (S11)' to start the
acceleration regeneration process in step (S12)'.
[0137] In addition, if no in the determination in step (S27), the
routine returns to step (S1).
[0138] The end of the normal regeneration process in step (S6)',
the start of the notification of the acceleration regeneration
request information in step (S10)' and the start of the
acceleration regeneration process in step (S12)' thereafter at the
time (T5) for acceleration regeneration request determination in
FIG. 4 are executed through such steps.
[0139] As shown in FIG. 7, if yes in the determination in step
(S21), that is, when the inhibition mode of the normal regeneration
process is selected during the acceleration regeneration
re-determination period (T3), the normal regeneration process is
ended in step (S20)' to determine in step (S21)' whether or not the
acceleration regeneration re-determination period (T3) has elapsed.
If no in the determination, it is determined in step (S22)' whether
or not the PM deposition amount estimation value is increased to
the acceleration regeneration request determination value (J2). If
yes in the determination, the notification of the acceleration
regeneration request information is started in step (S10)' to
perform the acceleration regeneration start operation, so that it
is determined yes in the determination in step (S11)' to start the
acceleration regeneration process in step (S12)'. If no in the
determination in step (S22)', the routine returns to step (S21)'.
If yes in the determination in step (S21)', the routine returns to
step (S1).
[0140] The end of the normal regeneration process in step (S20)',
the start of the notification of the acceleration regeneration
request information in step (S10)', and the start of the
acceleration regeneration process in step (S12)' thereafter by the
time the re-determination period (T3) elapses from the time (T6)
for mode switching in FIG. 5 are executed through such steps.
[0141] After the normal regeneration process is switched to the
acceleration regeneration process in step (S12) in FIG. 6, or after
the acceleration regeneration process is started in step (S26), as
shown in FIG. 8, it is determined in step (S28) whether or not the
PM deposition amount estimation value is decreased to the
acceleration regeneration request determination value (J2) which is
the lower limit value of the acceleration regeneration request. If
yes, the acceleration regeneration process is ended in step (S29)
to end the notification of the acceleration regeneration request
information in step (S30), so that the routine returns to step
(S1). If no in the determination in step (S28), the acceleration
regeneration process is continued in step (S31) to determine in
step (S32) whether or not the PM deposition amount estimation value
is increased to the DPF abnormality determination value (J4). If
yes in the determination, the notification of the DPF abnormality
information is started in step (S33), so that the routine returns
to step (S31). If no in the determination in step (S32), the
routine returns to step (S28).
[0142] The end of the acceleration regeneration process in step
(S29), the continuation of the acceleration regeneration process in
step (S31), and the start of the notification of the DPF
abnormality information in step (S33) in FIGS. 2 to 5 are executed
through such steps.
DESCRIPTION OF REFERENCE SIGNS
[0143] (1): DPF [0144] (2): PM deposition amount estimating unit
[0145] (3): DPF regenerating unit [0146] (4): DPF regeneration
control unit [0147] (5): Storage unit [0148] (6): Acceleration
regeneration request information notifying unit [0149] (7):
Acceleration regeneration start operating unit [0150] (8): DPF
abnormality information notifying unit [0151] (9): Common rail
system [0152] (10): DOC [0153] (11): Exhaust gas [0154] (41): Mode
selecting unit [0155] (J1): Normal regeneration end determination
value [0156] (J2): Acceleration regeneration request determination
value [0157] (J3): Normal regeneration start determination value
[0158] (J4): DPF abnormality determination value [0159] (T0): Time
for the increase of the PM deposition amount estimation value to J3
[0160] (T1): Acceleration regeneration request determination
reserve period [0161] (T2): Time for acceleration regeneration
request determination [0162] (T3): Acceleration regeneration
request re-determination period [0163] (T4): Time for
re-determination end [0164] (T5): Time for acceleration
regeneration request determination [0165] (T6): Time for mode
switching [0166] (S3): Start normal regeneration process [0167]
(S6): End normal regeneration process [0168] (S6)': End normal
regeneration process [0169] (S8): Continue normal regeneration
process [0170] (S10): Start notification of the acceleration
regeneration request information [0171] (S10)': Start notification
of the acceleration regeneration request information [0172] (S12):
Switch to acceleration regeneration process [0173] (S12)': Start
acceleration regeneration process [0174] (S17): Continue normal
regeneration process [0175] (S20): End normal regeneration process
[0176] (S20)': End normal regeneration process [0177] (S22): Start
notification of acceleration regeneration request information
[0178] (S24): Start notification of acceleration regeneration
request information [0179] (S26): Start acceleration regeneration
process [0180] (S29): End acceleration regeneration process [0181]
(S33): Start notification of DPF abnormality information
* * * * *